Thin-place detector for looms



Decgl, 1925- 1,564,129

wrrusssw- ATTORNEYS Patented Dec. 1, 1925.

UNITED STATES P'EENT FFICE.

JAMES MARION DAVIS AND CECIL VERNON THOMAS, OF NEWBERRY, SOUTH CAROLINA.

THIN-PLACE DETECTOR FOB LOOMS.

Application filed January 16, 1923.

To all whom 2'25 may concern:

Be it known that we, JAMES MARION DAVIS and Cnorn V. THOMAS, citizens of the United States, residing at Newberry, in the county of Newberry and State of South Carolina, have invented new and useful Improvements in Thin-Place Detectors for Looms, of which the following is a specification.

The object of our said invention is the provision of a thin place detector for looms, characterized by simplicity and inexpensiveness in construction, by adaptability to be expeditiously and easily installed, and by reliability in operation.

To the attainment of the foregoing, the invention consists in the improvement as hereinafter described and definitely claimed.

In the accompanying drawings, forming part of this specification Figure 1 is a perspective illustrative of a portion of a loom equipped with our improvement.

Figure 2 is an enlarged detail view Show ing the manner in which the detecting finger is mounted and spring-pressed.

Similar numerals of reference designate corresponding parts in both views of the drawings.

In general the loom is of ordinary well known construction and includes the usual breast beam 1 to which is fixed a hearing or bearings 2. Journaled in the said hearing or bearings 52 is a rock shaft 3 at one end of which is right angled disposed upstanding arm at having a hook formed on its free terminal portion. At the opposite end of the rock shaft 3, the said shaft is provided with an upstanding portion which together with a horizontal portion forms an arm 5 at the free end of which is a finger 6, pointed as illustrated. In the preferred embodiment of our invention the said finger is pivoted in a bifurcation of the a-rn'i and is backed by a collar l slidable on the arm which collar 4* is backed in turn by a coil spring 5*. This construction assures the finger being yieldingly held to its work and is advantageous because of its simplicity, ethciency and strength. Connected to the upper portion of the arm 4 is a cable 7 that is passed over a support 8, and is provided with a pendent portion 9 on which is a weight 10 preferably, though not necessarily, formed of metal or any other appropriate Serial No. 613,079.

material that is a good conductor of electricity. The said conductive member 10 in the preferred embodiment of our invention is arranged above and in close proximity to though normally spaced from terminals 11 and 12 comprised in the normally open electric circuit of a. warp-stop motion, the said warp-stop motion bein of the ordinary well known construction such as shown in Patent 774,316, dated November 8, 1904.

As before indicated the weight 10 normally rests above and in spaced relation to the terminals 11 and 12 which terminals without involving departure from the scope of our claimed invention may be of any appropriate character. The weight 10 is maintained in the spaced relation alluded to by the cloth 13 supporting the finger 6 so long as no thin place occurs in the cloth. When, however, a thin place in the cloth is pre sented to the finger 6, said finger 6 will be permitted to move downwardly under the action of the weight 10, the shaft 3 being of course rocked about its axis, and on gravitation of the weight 10 the electric circuit referred to will be completed and the warpstop motion will be put into play with the result that loss of material will be averted. Manifestly pressure of the detecting or filling finger G on the cloth may be regulated by the size of the weight referred to, this being a material advantage as heavy goods will require greater pressure than light goods or cloth. 7

It is within the purview of our invention to utilize the gravitation of the weight 10 for the actuation of a mechanical warp-stop motion, the weight 10 in that embodiment being appropriately combined with the shipper rod of the loom so that gravitation of the weight will move said rod.

It will be apparent from the foregoing that the detector illustrated is not only extremely simple and inexpensive in construction, but is susceptible of being readily installed at small expense; and it will also be apparent that the detector is reliable and prompt in operation inasmuch as gravitation of the weight member 10 will take place coincident with any downward movement of the finger 6 due to a thin place in the cloth that is being woven.

We have entered into a detailed descrip tion of the construct-ion and relative arrangement of the parts embraced in the present and preferred embodiment of the invention in order to impart a full, clear and ex act understanding of the said embodiment. IV e do not desire, however, to be understood as confining ourselves to the specific construction and relative arrangement of parts inasmuch as in the future practice of the invention various changes and modifications may be made: such as fall Within the scope of our invention as defined in our appended claim.

Having described our invention, what we claim and desire tosecure by Letters- .Patent, is

In a means for the purpose described, the combination of a rock shaft carried on the breast beam of a loom, a right angled disposed upstanding arm formed on one end of said rock shaft, a hook formed on the terminal of said right angled disposed up-- standing arm, an upstanding portion formed on the opposite end of said rock shaft, a horizontally disposed arm formed on said upstanding portion and having'its free end bifurcated, a spring pressed finger pivoted between the bifurcations, a cable fixed to said hook and having a pendent portion, a Weight on the end of said pendent portion and a pair of terminals in an electrical oirouit arranged in spaced relation to be crossed bysaid Weight as and for the purpose specified.

In testimony whereof we afiix our signatures.

JAMES MARION DAVIS.

CECIL VERNON THOMAS. 

